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PQRS is a rhombus with area 24 square centimetres. One of is diagonal PR-6 centimetres. The length of PS is:

WhatsApp Image 2024-12-02 at 23.27.57.jpeg

A6 centimetres

B4 centimetres

C8 centimetres

D5 centimetres

Answer:

D. 5 centimetres

Read Explanation:

Solution

Given: Area of rhombus (PQRS=24cm2</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">DiagonalPR=6cm</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">Theareaofarhombusis</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">(PQRS = 24cm²</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">Diagonal PR = 6cm</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">The area of a rhombus is</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">A=\frac{1}{2} d_1d_2</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">So,</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">So,</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">24=\frac{1}{2}(6)(QS)</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">48=6(QS)</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">QS=8\text{ cm}</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">Thediagonalsofarhombusbisecteachotheratrightangles.</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">Therefore,</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">The diagonals of a rhombus bisect each other at right angles.</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">Therefore,</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">\frac{PR}{2}=3\text{ cm},\qquad \frac{QS}{2}=4\text{ cm}</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;">UsingPythagorasintherighttriangleformedbyhalfthediagonals:</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">Using Pythagoras in the right triangle formed by half the diagonals:</p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">PS^2=3^2+4^2 PS^2=9+16=25</p><pdata−pxy="true"style="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px;"></p><p data-pxy="true" style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px;">\boxed{PS=5\text{ cm}}$


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